Quick Specs

• Supports AMD Ryzen 7000/8000/9000 Series Processors for powerful performance.


• Features PCIe 4.0 slot for lightning-fast graphics card and SSD speeds.


• Includes SafeSlot Core+ for enhanced PCIe slot strength and durability.


• Offers BIOS FlashBack for simple and safe BIOS updates.


• Equipped with a pre-mounted I/O shield for easy installation and protection.

Built for Today's Demands

ASUS PRIME series motherboards are expertly engineered to unleash the full potential of AMD Ryzen 7000/8000/9000 series processors. Boasting a robust power design, comprehensive cooling solutions, and intelligent tuning options, the PRIME B650M-A-CSM provides everyday users and PC DIY builders with a range of performance optimisation options via intuitive software and firmware features.

Lightning-Fast Connectivity

Experience next-level speed with the PCIe 4.0 slot, supporting the latest graphics cards and NVMe SSDs. Enjoy data transfer rates that are twice as fast as the previous generation, ensuring your system is ready for demanding tasks such as gaming, content creation, and productivity. This ASUS AM5 motherboard ensures your system remains cutting edge.

EZ PC DIY Design

Building a PC has never been easier. The PRIME B650M-A-CSM incorporates numerous DIY-friendly designs, including SafeSlot Core+ for enhanced PCIe slot retention and Q-LED Core for simple troubleshooting. The pre-mounted I/O shield streamlines the installation process and protects against electrostatic discharge. This AM5 micro ATX motherboard simplifies the build process.

Dependable Stability

ASUS motherboards are renowned for their durability and long-term reliability. The PRIME B650M-A-CSM utilises high-quality components, comprehensive cooling solutions, and rigorous testing to ensure it can withstand the demands of continuous use, providing you with a stable and dependable platform for years to come.

Optimised Cooling

The PRIME B650M-A-CSM features comprehensive cooling controls that are configurable via Fan Xpert 2+ software or via the UEFI BIOS. Multiple temperature sensors and dedicated fan headers allow you to optimise cooling performance based on your system's specific needs, ensuring stability and preventing thermal throttling, even under heavy workloads. The ASUS AM5 motherboard provides excellent thermal management.

FEATURES:

• Intel H840M Chipset


• Supports AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors


• Supports DDR5 Memory, Dual Channel DDR5 7600+ MT/s (OC) 256GB max capacity


• Ultra-fast Realtek 2.5G Ethernet LAN


• Lightning Fast Game experience: PCIe 4.0 slot support


• Asus Fan Xpert 2+ for more cooling control


• EZ PC DIY: SafeSlot Core+ and Q-LED Core, BIOS Flashback, and a pre-mounted I/O shield for easy usage


• Aura Sync support for full RGB lighting control

SPECIFICATIONS:

• CPU:
  
  
  
  • AMD Socket AM5 for AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors*
  
  
  • * Refer to https://www.asus.com/support/download-center/ for CPU support list.
  
  
  
  


• Chipset: AMD B840 Chipset


• Memory:
  
  
  
  • 4 x DIMM slots, max. 256GB, DDR5
  
  
  • Supports up to 7600+MT/s (OC) with Ryzen™ 9000 & 8000 & 7000 Series Processors, ECC and Non-ECC, Un-buffered DIMM*
  
  
  • Dual channel memory architecture
  
  
  • Supports AMD Extended Profiles for Overclocking (EXPO™)
  
  
  • ASUS Enhanced Memory Profile (AEMP)
  
  
  • * Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory configuration
  
  
  • * Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.
  
  
  
  


• Graphics:
  
  
  
  • 2 x DisplayPort**
  
  
  • 1 x HDMI™ port***
  
  
  • * Graphics specifications may vary between CPU types. Please refer to AMD CPU specifications.
  
  
  • ** Supports max. 8K@30Hz as specified in DisplayPort 1.4.
  
  
  • *** Supports 4K@60Hz as specified in HDMI 2.1.
  
  
  
  


• Expansion Slots:
  
  
  
  • AMD Ryzen™ 9000 & 7000 Series Desktop Processors*
  
  
  • 1 x PCIe 4.0 x16 slot (supports x16 mode)
  
  
  • AMD Ryzen™ 8000 Series Desktop Processors
  
  
  • 1 x PCIe 4.0 x16 slot (supports x8/x4 mode)**
  
  
  • AMD B840 Chipset
  
  
  • 2 x PCIe 3.0 x16 slots (support x1 mode)
  
  
  • * Please check the PCIe bifurcation table on the support site (https://www.asus.com/support/FAQ/1037507/).
  
  
  • ** Specifications vary by CPU types.
  
  
  • To ensure compatibility of the device installed, please refer to https://www.asus.com/support/download-center/ for the list of supported peripherals.
  
  
  
  


• Storage:
  
  
  
  • Total supports 3 x M.2 slots and 4 x SATA 6Gb/s ports
  
  
  • AMD Ryzen™ 9000 & 7000 Series Desktop Processors
  
  
  • M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode)
  
  
  • M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
  
  
  • AMD Ryzen™ 8000 Series Desktop Processors
  
  
  • M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode)
  
  
  • M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4/x2 mode)*
  
  
  • AMD B840 Chipset
  
  
  • M.2_3 slot (Key M), type 2280 (supports PCIe 3.0 x4 mode)
  
  
  • 4 x SATA 6Gb/s ports
  
  
  • * Specifications vary by CPU types.
  
  
  
  


• RAID:
  
  
  
  • AMD RAIDXpert2 Technology
  
  
  • Ryzen™ 9000 Series Processors: RAID 0/1/5/10
  
  
  • Ryzen™ 8000 Series Processors: RAID 0/1
  
  
  • Ryzen™ 7000 Series Processors: RAID 0/1/10
  
  
  
  


• Ethernet:
  
  
  
  • 1 x Realtek 2.5Gb Ethernet
  
  
  • ASUS LANGuard
  
  
  
  


• Rear USB (Total 7 ports):
  
  
  
  • 2 x USB 10Gbps ports (2 x Type-A)
  
  
  • 1 x USB 5Gbps port (1 x USB Type-C®)
  
  
  • 4 x USB 2.0 ports (4 x Type-A)
  
  
  
  


• Front USB (Total 7 ports)
  
  
  
  • 1 x USB 5Gbps connector (supports USB Type-C®)
  
  
  • 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports
  
  
  • 2 x USB 2.0 headers support 4 additional USB 2.0 ports
  
  
  • * USB Type-C® power delivery output: max. 5V/3A
  
  
  
  


• Audio:
  
  
  
  • Realtek 7.1 Surround Sound High Definition Audio CODEC*
  
  
  • Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking
  
  
  • Supports up to 24-Bit/192 kHz playback
  
  
  
  


• Audio Features:
  
  
  
  • Audio Shielding
  
  
  • Premium audio capacitors
  
  
  • Dedicated audio PCB layers
  
  
  • *A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.
  
  
  
  


• Back Panel I/O Ports:
  
  
  
  • 2 x USB 10Gbps ports (2 x Type-A)
  
  
  • 1 x USB 5Gbps port (1 x USB Type-C®)
  
  
  • 4 x USB 2.0 ports (4 x Type-A)
  
  
  • 2 x DisplayPort
  
  
  • 1 x HDMI™ port
  
  
  • 1 x Realtek 2.5Gb Ethernet port
  
  
  • 3 x Audio jacks
  
  
  • 1 x BIOS FlashBack™ button
  
  
  
  


• Operating System: Windows 11, Windows 10 64-bit


• Form Factor: Micro ATX

WHAT’S IN THE BOX:

• Asus PRIME H840M-A-CSM AM5 Micro ATX Motherboard – Black x1


• SATA Cables x2


• M.2 rubber package x1


• Screw Package for M.2 SSD x2


• Quick Start Guide x1

Why Asus?

ASUS is a globally recognised tech company renowned for quality and innovation. For over three decades, ASUS has consistently delivered cutting-edge PC components and electronics, earning the trust of gamers, professionals, and everyday users alike. Choose ASUS for reliability, performance, and a commitment to pushing the boundaries of what's possible. When building your next PC, an ASUS AM5 motherboard is a solid foundation.